I assume you mean the hill by the herb camp in Thunderhoof Tamora - but there is nothing there for me

Any other suggestions please? My toon is stuck on level 60 forever with nothing to do but dailies unless I find this quest line.
A couple of possibilities here,
First, if you have not done the herb camp quests, can't get them, you need to go back to that village, whatever its called, with all the streams, get the quests inside the pub, all of them because they key the 2 main quest chains. The chains are Dragon Envoy & Return the Glory.
It's the quest delivering the medical supplies (found upstairs in the pub) that keys the herb camp quests.
Secondly, if you have already done the above then it sounds like you need to do the quests inside the Sewers, the ones given by the giant white mouse/rat. Most likely the Mr Pipes quest.
This link & others on the quest menu may help;
http://www.runesdatabase.com/quest/list/1.202